Numerator of Sum_{k=1..2n+1} 2^k/k.

A229727

Numerator of Sum_{k=1..2n+1} 2^k/k.

Terms

    a(0) =2a(1) =20a(2) =256a(3) =4832a(4) =42496a(5) =1467392a(6) =62836736a(7) =42790912a(8) =2535587840a(9) =170851041280

External references